An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Hayen H, Karst U.Hayen H, et al. Among authors: karst u.J Chromatogr A. 2003 Jun 6;1000(1-2):549-65. doi: 10.1016/s0021-9673(03)00505-3.J Chromatogr A. 2003.PMID: 12877188Review.